Curiosity.

To surround anything, however monstrous or ridiculous, with an air of mystery, is to invest it with a secret charm, and power of attraction which to the crowd is irresistible. False priests, false prophets, false doctors, false patriots, false prodigies of every kind, veiling their proceedings in mystery, have always addressed themselves at an immense advantage to the popular credulity, and have been, perhaps, more indebted to that resource in gaining and keeping for a time the upper hand of Truth and Common Sense, than to any half-dozen items in the whole catalogue of imposture. Curiosity is, and has been from the creation of the world, a master-passion. To awaken it, to gratify it by slight degrees, and yet leave something always in suspense, is to establish the surest hold that can be had, in wrong, on the unthinking portion of mankind.

Charles Dickens